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    • 2. 发明授权
    • Stabilization of intracellular enzymes
    • 稳定细胞内酶
    • US4950596A
    • 1990-08-21
    • US20407
    • 1987-03-02
    • Roberta C. ChengNorman G. MollRobert A. HoutchensKaren M. McCoy
    • Roberta C. ChengNorman G. MollRobert A. HoutchensKaren M. McCoy
    • C12N1/04C12N9/96C12N11/02C12N11/04C12P19/24
    • C12P19/24C12N1/04C12N11/02C12N11/04C12N9/96
    • The subject invention concerns a process for stabilizing intact or ruptured microbial cells having glucose isomerase associated therewith. Specifically exemplified is a process for stabilizing glucose isomerase producing cells of a microorganism belonging to the genus Ampullariella. In the invention process the whole or ruptured microbial cells are contacted with a partially carboxyalkylated- or partially phosphonoalkylated-cationic polyelectrolyte, for example, a partially carboxymethylated polyethyleneimine to flocculate and stabilize the cells. The flocculated cells are further stabilized by encapsulation with a partially carboxyalkylated- or partially phosphonoalkylated-cationic polyelectrolyte. The encapsulation can be done prior to or after the flocculated cells are crosslinked. The net effect is manifested by a dramatic increase in the half-life of the glucose isomerase.
    • 本发明涉及用于稳定具有与其相关的葡萄糖异构酶的完整或破裂的微生物细胞的方法。 具体举例说明了稳定葡萄糖异构酶产生细胞的方法,该细胞属于安瓿属(Ampullariella)属。 在本发明方法中,将全部或破裂的微生物细胞与部分羧烷基化或部分膦酰烷基化阳离子聚电解质(例如部分羧甲基化的聚乙烯亚胺)接触以使细胞絮凝和稳定。 通过用部分羧烷基化或部分膦酰烷基化阳离子聚电解质包封进一步稳定絮凝的细胞。 可以在絮凝的细胞交联之前或之后进行封装。 净效应表现在葡萄糖异构酶的半衰期急剧增加。
    • 10. 发明授权
    • Enzyme immobilization with polysulfonium salts
    • 用多锍盐固定酶
    • US4929556A
    • 1990-05-29
    • US216916
    • 1988-07-08
    • Roberta C. ChengRitchie A. WesslingDonald L. Schmidt
    • Roberta C. ChengRitchie A. WesslingDonald L. Schmidt
    • C12N11/02C12N11/12C12P19/24
    • C12P19/24C12N11/02C12N11/12
    • Polysulfonium salts that can react with nucleophilic groups and covalently cross-link are used to immobilize enzymes or enzyme-containing cellular material. Some of the polysulfonium salts can both flocculate and covalently cross-link. Replacement of the cross-linker, glutaraldehyde, with the polysulfonium salt results in greater retention of enzyme activity during immobilization. Immobilization is carried out by forming a mixture of an enzyme or enzyme-containing cellular material and the polysulfonium salt and subjecting the mixture to conditions such that sulfonium ions react with nucleophilic groups contained by the enzyme or cellular material to form a covalently cross-linked and water insoluble product. The enzyme or cellular material may be flocculated with a flocculating agent prior to cross-linking with the polysulfonium salt. The polysulfonium salt can be a polymer containing sulfonium groups.
    • 可与亲核基团反应并共价交联的聚锍盐用于固定酶或含酶细胞材料。 一些聚锍盐可以絮凝和共价交联。 用聚锍盐替代交联剂戊二醛导致固定期间酶活性的更大保留。 通过形成酶或含酶细胞材料和聚锍盐的混合物进行固定,并使混合物经受使锍离子与酶或细胞材料所含的亲核基团反应以形成共价交联和 水不溶物。 在与多锍盐交联之前,酶或细胞材料可以用絮凝剂絮凝。 聚锍盐可以是含有锍基团的聚合物。